717664487 has 4 divisors (see below), whose sum is σ = 719454576. Its totient is φ = 715874400.

The previous prime is 717664481. The next prime is 717664553. The reversal of 717664487 is 784466717.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 717664487 - 2²² = 713470183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (717664481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894443 + ... + 895244.

It is an arithmetic number, because the mean of its divisors is an integer number (179863644).

Almost surely, 2^717664487 is an apocalyptic number.

717664487 is a deficient number, since it is larger than the sum of its proper divisors (1790089).

717664487 is a wasteful number, since it uses less digits than its factorization.

717664487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790088.

The product of its digits is 1580544, while the sum is 50.

The square root of 717664487 is about 26789.2606654234. The cubic root of 717664487 is about 895.3107903932.

The spelling of 717664487 in words is "seven hundred seventeen million, six hundred sixty-four thousand, four hundred eighty-seven".